课外书用英语怎么说

我们也可以利用星期日来看看课外书。
We may often utilize Sundays to read reference books.
露茜:你喜欢看什么课外书?
Lucy: What kinds of extra readings do you like?
我希望上大学能博览群书，把以前我想看但没时间看的课外书看了。
And I hope I can read widely and try to read all the extracurricular books I wanted to read before but didn't have enough time.

extra-curriculum book

reference books
extra readings
extra-curricular books
outside readings

课外书
Extra-curricular books